Orion OB1

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What Wikipedia says

Orion OB1 (Ori OB1) is a contingent group of several dozen hot giant stars of spectral types O and B in Orion. Associated are thousands of lower-mass stars, and a (smaller but significant) number of protostars. It is part of the larger Orion molecular cloud complex.

Excerpt from the Wikipedia article “Orion OB1”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Orion 3008 huge-OB1.png: Mouser, Roberto Mura derivative work: Sadalsuud, CC BY-SA 3.0, via Wikimedia Commons.